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(ModeL) J. H. LUUKHURST.

BURGLAR ALARM.

No. 244,064. Patented Ju1 '12, 1881.

Wain asses;

ym 67 ww 1, Washington. D C

UNITED STATES PATENT OFFICE.

JAMES H. LUOKHUEST, OF RAHWAY, NEW JERSEY, ASSIGNOR OF ONE HALF TO D. F. COLES, OF SAME 'PLAOE.

BURGLAR-A LARM.

SPECIFICATION forming part of Letters Patent No. 244,064, dated July 12, 1881.

Application filed March 23, 1881.

To all whom it may concern Be it known that I, JAMES H. LUCKHURST, a citizen of theUnited States, residing at Bahway, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Burglar-Alarms and I do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon,

\ which form a part of this specification, and in which Figure 1 is a side elevation of my improvement in burglar-alarms with the case removed. Fig. 2 is a similar view of the same with the case in position, and Figs. 3 and 4 are detail views thereof.

This invention has relation to improvements upon my burglar-alarm for which a patent was granted to me February 22, 1881, it being numbered 238,135, and refers more particularly to the means for inclosing the operative mechanism.

The nature of my improvement consists of an inclosing-case, its more important characteristic being its separability, substantially as hereinafter more fully set forth and claimed.

Referring to the accompanying drawings, A A A A refer, respectively, to the knob-cam, the lever acted upon by the said cam, the belloperating mechanism, and the bell, all of which is arranged and constructed substantially as shown and described in my above-referred-to patent.

B B refer to the case, composed, one part, B, of an inclosure for the bell and its operating mechanism, made preferably, in the main, rectangular in shape, with a rounded or archshaped upper end. This inclosure is cast with the necessary perforations, slots for the bellswitching lever a, spindle-aperture for the adjusting-knob a of the bell-operating mechanism, and ears for the reception of screws or other suitable fastenings for securing the inclosure upon the door, to which this alarm is (ModeL) specially adapted. It is further cast with an opening, I), at the lower end of that side next the knob. The other part, B, of this case is ofan approximate S shape, as shown in Figs..2 and 4, and adapted to inclose the knob-cam A and lever A, the two-part case B B thus inolosingthewholealarinmechanism. Theknob end of this part B is fitted, around the spindle of the knob, with a bearing-rose, c, and upon its sides with fastening cars, after the form of the ears upon part B. The lower end of the part B is adapted, as at d, to permit of its entrance into the part B at I), with the shoulder d resting upon the lower edge or bot-- tom of the part B, thus uniting the parts together, while they are adapted to be readily taken apart, as occasion may require. By this construction the parts of the case are rendered separable, to permit of the adjustment of a disarranged part without requiring the removal of the whole case.

Having thus fully described my invention, I claim and desire to secure by Letters Patent The combination, with the spindle of the door-knob, having a cam, A, fixed thereon, a lever pivoted to the door and connecting the cam A with the clock-train or alarm mechanism, and the clock-train and alarm mechanism, of the removable two-part casing B B, the casing B covering the clock-train and being provided with a winding-key, a, swiveled therein and arranged to fit down on the end of the post of the clock-train, and the part B being provided on its outer end with a rose or hearingplate, 0, covering the cam A, and having its inner end snugly jointed with the inner edge of the case B, all arranged substantially as and for the purposes set forth.

In testimony whereof I affix my signature, in presence of two witnesses, on this 12th day of March, 1881.

JAMES H. LUOKHURST.

Witnesses J. O. TEMISON, SoLoMoN WILsoN. 

